21325924 has 9 divisors (see below), whose sum is σ = 37336537. Its totient is φ = 10658344.

The previous prime is 21325919. The next prime is 21325943. The reversal of 21325924 is 42952312.

The square root of 21325924 is 4618.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 3534400 = 4218^2 + 1880^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21325892 and 21325901.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8082 + ... + 10390.

Almost surely, 2^21325924 is an apocalyptic number.

21325924 is the 4618-th square number.

It is an amenable number.

21325924 is a deficient number, since it is larger than the sum of its proper divisors (16010613).

21325924 is an frugal number, since it uses more digits than its factorization.

21325924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4622 (or 2311 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The cubic root of 21325924 is about 277.3123976173.

The spelling of 21325924 in words is "twenty-one million, three hundred twenty-five thousand, nine hundred twenty-four".